SET AERO can conduct NDT testing on location or at our facilities. We have the capability to perform our testing in the field in the case time is of the essence or when is just not feasible to send you part in. We can conduct our testing anywhere in the world and our team members can usually be deployed within 24 hours.
In eddy current testing, electrical currents are generated in a conductive material by an induced magnetic field. Interruptions in the flow of the electric currents (eddy currents), which are caused by imperfections or changes in a materialâ€™s conductive properties, will cause changes in the induced magnetic field. These changes, when detected, indicate the presence of a change in the test object.
Ultrasonic nondestructive testing, also known as ultrasonic NDT or simply UT, is a method of characterizing the thickness or internal structure of a test piece through the use of high frequency sound waves. The frequencies, or pitch, used for ultrasonic testing are many times higher than the limit of human hearing, most commonly in the range from 500 KHz to 20 MHz.
Liquid Penetrant testing is probably the most widely used NDT method. The test object or material is coated with a visible or fluorescent dye solution. The excess dye is removed from the surface, and then a developer is applied. The developer acts like a blotter and draws penetrant out of imperfections which open to the surface. With visible dyes, the vivid color contrast between the penetrant and the developer makes the â€œbleedoutâ€ easy to see. With fluorescent dyes, an ultraviolet lamp is used to make the â€œbleedoutâ€ fluoresce brightly, thus allowing the imperfection to be seen readily.
Magnetic particle testing is done by inducing a magnetic field in a ferroâ€”magnetic material and dusting the surface with iron particles(either dry or suspended in a liquid). Surface imperfections will distort the magnetic field and concentrate the iron particles near imperfections, thus indicating their presence. Magnetic Particle Testing or Magnaflux as it is sometimes called uses magnetic leakage fields to detect surface and subsurface cracks and discontinuities.
Ultrasonic Phased Array
Phased array probes typically consist of a transducer assembly with from 16 to as many as 256 small individual elements that can each be pulsed separately. These may be arranged in a strip (linear array), a ring (annular array), a circular matrix (circular array), or a more complex shape. As is the case with conventional transducers, phased array probes may be designed for direct contact use, as part of an angle beam assembly with a wedge, or for immersion use with sound coupling through a water path. Transducer frequencies are most commonly in the range from 2 MHz to 10 MHz.
Eddy Current Array
a nondestructive testing technology that provides the ability to electronically drive multiple eddy current coils, which are placed side by side in the same probe assembly. Each individual eddy current coil in the probe produces a signal relative to the phase and amplitude of the structure below it. This data is referenced to an encoded position and time and represented graphically as a C-scan image.
Radiography involves the use of penetrating X or gamma radiation to examine parts and products for imperfections. An xâ€”ray machine or radioactive isotope is used as a source of radiation. Radiation is directed through a part and onto film. When the film is developed, a shadowgraph is obtained that shows the internal soundness of a part. Possible imperfections show up as density changes in the film, in much the same manner as an xâ€”ray can show broken bones.
An optical instrument used for inspection work where the area to be inspected is inaccessible by other means, borescopes can be rigid, flexible and semi-rigid. A rigid borescope has an eyepiece on one end and an objective lens on the other linked together by a lens relay system. Flexible and semirigid scopes use fiber optics, instead of traditional lenses, to relay images and transmit light.
Used on site to detect damage in fibre-reinforced and other laminated materials. Damage to aircraft can often occur after collisions with bird, baggage handling equipment or water ingress. The damage caused is not always immediately visible. Delamination, ruptures and structural flaws may occur and can result in a loss of structural integrity. ELCH can establish within seconds whether an aircraft can continue flying or if it needs to undergo repairs.
Thermal NDT methods involve the measurement or mapping of surface temperatures as heat flows to, from and/or through an object. The simplest thermal measurements involve making point measurements with a thermocouple. This type of measurement might be useful in locating hot spots, such as a bearing that is wearing out and starting to heat up due to an increase in friction. The basic premise of thermographic NDT is that the flow of heat from the surface of a solid is affected by internal flaws such as disbonds, voids or inclusions.
Pulse thermography (PT) is one of the most popular thermal stimulation method in IR thermography. One reason for this popularity is the quickness of the inspection relying on a thermal stimulation pulse, with duration going from a few ms for high thermal conductivity material inspection (such as metal parts) to a few seconds for low thermal conductivity specimens (such as plastics, graphite epoxy components). Such quick thermal stimulation allows direct deployment on the plant floor with convenient heating sources. Moreover, the brief heating prevents damage to the component (heating is generally limited to a few degrees above the initial component temperature).
Ultrasonic bond-testing is a useful means of verifying that layers of material that have been glued together with adhesive are actually bonded together. For structures where thin layers metal or laminate are bonded together a variation known as “resonance” testing can be invaluable. A second variation, “mechanical impedance analysis” (MIA) is useful in detecting defects between the skin and cores cells of sandwich structures.